Typewriting machine



www3

um e, 1925.

W. P. KIDDER TYPEWRITING MACHINE original Filed Sept. 18, 1920 4 Sheets-Sheet 1 jan, 6, i925.

w. P. KIDDER TYPEWRITING MACHINE 4 Sheets-Sheet Original Fl'ed Sept. 18, 1920 D' Arm/mfr jan, 6,

W. P. KIDDER TYPEWRITING MACHINE 4 sheets-sheet s Original Filed Sept. 18, 1920 @mld-"Elfi ATTORNEY y 1,522,193 w. P. KIDDER TYPwRITmG MACHINE originalFiled sept. 1a, 1920 lashed-sheet 4 Jan, 6, 1925.

Patented 6,

' l `UNITED sTTE'sj PATENT OFFICE'.-

WELLINGTONPARKER RIDDER, or GREENWICH, CONNECTICUT, Assia; 0R 'rojRociIE's- TER INDUSTR-Iris, INC., or ROCHESTER, NEW YORK, A CORPORATION OE NEW YORK.

TYPEWRITING MACHINE. A

Application mea september 1s, 192o, sria1 No. 411,146. Renewed. January 1s, i924.

To all whom lt may Concern.'

"Be it known that I, WELLINGTON PARKER KIDDER, a citizen of the United States, and

I a resident of Greenwich, in the county'oi Fairfield and State of Connecticfl-,j have 1nvented certain newv and useful lznprovements in 'lypewriting Machines',l of which the following is atspecication.

This invention relates to atypewriting Its objects and advantages are i lightness of weight; eiiiciency of impression; silence in operation; the demountability of type bars whereby type bars having, one style of lprinting characters of a given language may be substituted for type barsha/ving other styles of' printing char- Aam acters pertaining to that language.; and

whereby, ifA desired,.type,barshaving the printing characters of one llanguage may be substituted for type bars having the printing characters .of another language; and a single platen and paper carriage shifting mechanism; Nevertheless the Vmechanism for operating the type bars which severally ,carry a plurality of printing characters -isl also useful in double Ashift platen and paperv carriage constructions. The paper Iand platen carriage actuating mechanisms may be use-ful, even though the` type bars carry@ only one printing character` each and may be also useful with other constructions of type bar actuating mechanisms. It is also noted that a typewriting machine embodying the vpresent invention comprises an -endwise movable platen and paper carriage which'is given a vertical shifting movement to bringthe 4print-ing y point of the platen into one or-another of .a

plurality of .positions for receiving theimpression of lany onev of a plurality of lcharf acters on a type bar, one above another in v .the form nowA shown; the usual transversely extending escapement rack-bar iixed to the carriage being also given a carrespondi'ngl movement during the vertical shiftsofthe carriage, and my newescapemen't movement co-operating with the rack-bar'being given va rocking. movement for co-operation with th'e rack-barif rIn the accompanying drawings forming v part hereof and' illustrating the invention in the best form now known tofme:

rFig. 1 is a top plan View of a portion of a typewriting machine embodying the present described key being shown for greater clearness and the others. being removed. f

Fig. `2 is a vertical elevational section from front to back of the -machine, being in section at a line corresponding to line 2 2 of Fig. .1, and showing theendwise movable platen and paper carriage, andfparts carried by it and cooperating with it; the single,`

key-actuated shift mechanism therefor; and

for cooperation with type bar guides as in the prior art.

Fig. 3 is Ia rear elevational view of the machine, and particularly shows, in .rear elevation, my new paper and platen carriage escapem'ent mechanism. Y

Figull is a top plan view, partly-in section at line 4:'-4 of Fig. 2 Vof my new escapement mechanism.

The carriage invention, vonly one typebar/and its actuat- V ing means between the type barand nger Fig. 5 isa perspective view of the typ'ebar actuating mechanism detached. A

Fig. 6 is an end view of the' platen and paper carriage detached.

, Fig. 7 is a vertical section atline 7.-7 of Fig. 1, of the .parts-shown in F the position which they have -at the time of:

'impression by the higher character of the type bar. A

Fig. 8 is a'p'erspective view. of members of the carriage shifting mechanism detached'.

-In that form of the invention now set ig. l, but in forth,a low and approxi-mately rectangular,

upstanding main frame comprises a pair' of opposed side frames vtransversely connected .by a front-member 1 and by a rearmember 1. The rear ends of the side framesY terminate each in an upstanding 'corner,arm 2.

'forwardly of which the upper ledge of each side frame terminates. at a distance forwardly ofla corner arm 2, thus rming in the upperedgefof each side'fra e' a depression as at 4 'in order to make'roomfor various operating parts, and to permit endwise travel of the platen and paper carriage past the side frames. The continuous forward edge wall of the arm 2, of the bottom of the depression 4 and of the upper rear end of the side frame is indicated by 5. Forwardly of suoli depression and extending to the front edge of a type-bar supporting frame, the upper edgeof each side frame is horizontal, and the type-bar supporting frames 3. The frame also comprises a horizontal, dependent, transverse front bar 7c and is formed with endwise opposed, transverse openings 7 d adjacent the rearward edge of its front bar 7c. A transverse typebar cover plate 8, having dependent' end arms 8u each formed with an out-turned flange 8b and secured to the frame 7 at :11, coversv all the type bars which stand edgewise and are endwise reciprocatable between the frame 7 and the cover plate 8; their under and upper edges respectively belng in sliding contact with said plates, each of which is provided with opposed guides spaced laterally apart to form an upper guide-way for the upper, and an under guide-way for the under side margin of a type bar.' All the type bars are mounted radially to the impression point at p on the platen roll P which is mounted in a vertically raisable and lowerable, transversely movableplaten and paper 7 carriage comprising opposed, dependent end plates 9-whicl'1 travel through the frame depressions 4 during endwise movements of the carriage. The cover plate 8 is provided with dependent pins 8e and the upper surface of frame 7 is provided with grooves 8d to form said opposed guide-ways for each type-bar. In Fig. 1, only one guide-way 8d is shown, dot and dash lines indicating the remainder of the guide-ways 8d `and the direction of travel of the type bars.

The platen carriage, end plates 9 have dependent extensions 9 the under ends of which are transversely connected by a thereto fixed tube 10, the under wall of which has a lengthwise extending slot 11 to permit the carriage to travel endwise in either direction, beyond an end of the transverse.l cross-sectionallyv round` carriage guide andv lifting rod 12, on which the tube 10 is endy wise-slidably, mounted; the ends of the rod 12 being each fixed to an outward end of a roc-ker arm '13, and the rearward ends'of the rocker arms 13 being each pivoted on a stud 14 projecting from the inner side of a side frame, corner arm 2, rearwardly of the depressions 4. The bottom edges of the plates 9 are each slotted at 111 to register with the tube slot 11.

The .rocker frame thus formed by the rocker shaft 14, the roeker arms 13, and the carriage guide and lifting rod l2, has its front side member which is the guide and lifting rod 12, operative, at its end portions, in the side yframe depressions 4 whereby marked compactness of machine construction is effected; the platen carriage being shiftable'up and down above the bottom walls of such depressions 4 to raise or lower the impression point on--the platen; and the type-bar supporting frame being provided, on its upper side, with as many type bars as are desired; vand ,being also provided with key actuated, type-bar actuating mechanisms, and also with a platen carriage shift mechanism that is in co-opera- .tive relation with a carriage feed escapement mechanism, the transverse L-shaped rack bar R of which is shown carried by dependent end brackets R of the carriage, (Figs. 2 and rlhe type-bar actuating key levers 15 are formedl severally with an upturned front end provided with a charactered button head and have their rear ends formed with an upwardly and forwardly extending hook 15a pivoted on a transverse pivot rod 16 the ends of which are fixed in the upstanding frame members 3 at the frontof said del pressions 4. All the hooked ends of the type-bar actuating key levers 15 are retained in their pivoted position on the pivot rod 16 by means of a transverse retaining bar l1s fixed at 17L to a 17 each end of which side frame.

Between its ends, each key lever 15 is provided with a laterally projecting cam roll 18 for engagement by the front edge of au upstanding rockable wiper Vcam 19, one of which is provided for each key lever, and has its under end pivoted on a transverse straight pivot rod 20, the ends of which are carried by the side fralnes 3, forwardly of the pivot rod 16. The rear edge 21 of each wiper cam 19 is slightly convex, and when a key lever 15 is depressed, the cam roll 18 which is forward of the upwardly and rearwardly slanting front edge 22 of the wiper cam, rides downwardly on the front edge 22 and thereby rocks the wiper cam rearwardly bringing its convexv edge 21 gradually and silently into bearing contact with the forwardly extending straight and horizontal extension 23'of a spiral spring 23a,

end of each 'horizontal spring extension 23 being secured at' 23h to the under lll) end of a wiper cam 19 below the pivot rod 20. To an upper portion of each wiper cam 19, the lower end of an upwardly extending link is pivoted at 26, rearwardly of the pivot rod 20; the upper end of the link being pivoted at 27 to the lower portion of, and between the ends of, an approximately U-shaped lever 28, each end of which is shown forked.

The tension of the spring 23 keeps the front edge 22 of the wiper cam in constant contact with' the cam roll '18 on the key lever 15 so that, when in action the key lever is depressed to bring the rear edge of the wiper cam into progressive or gradual rocking contact with the straightened portion 23 of the spring 23. The mechanical co-operation of a key lever with the front edge 22 of a wiper cam 19 is silent, there being nothing in the nature of a hammer blow resulting from this rolling contact. A

The concave edge of each lever 28 is forwards. The under end, fork arms of each lever 28 straddle an4 ear 29 dependent from a bracket 30, which is provided, for each lever 28, with a pair of upstanding fork arms 31, the bracket 30 carrying the levers 28v being arranged transversely of the machine and being fixed by clamp screws 32 to the front cross bar 7 c of the type-bar supporting frame, the shape of which is shown in Fig. 1. and the slots 71 in which make room for mounting and operating the levers 28 and links 25.

The upper forward end of each U-shaped lever 28 is provided with av cani roll at 28" between its fork arms, the calnroll working in the lengthwise extending concavoconvex cam slot 33, the concave edge of which is forwards and the convex edge of which is rearwards, formed in an 4upstanding cam lever 34, ythe under end of which 1s pivoted at y35 between upstanding arms 31 of the bracket 30. The upper front portion of each eamlever 34 is provided with an ear 37 on which the front forked end 38 of a type bar link 39 is pivoted at 40', the rearward end of;I this link being also forked and formed on'its under side with an open, pinreceivingslot41 for detachable engagement with the lpivotpin 42 through and projectendwlse slidable'type-bar 43 which is nor- 'mally retained in detachable pivoted conof' printing characters belonging to a given language or by type bars having the printing characters of a different language.`

ing from both sides of thefront end of the The rear end of each type bar is rovided with two printing characters c one aovethe other, the type bar having at its upper rear corner and also4 at its lower rear corner a guide projection 3/ as heretofore and for cooperation with guides that are located` adjacent the platen, as heretofore and as now indicated by z. l

Depression of a type-bar actuating key lever 15 throws its wiper cam 19 rearwardly and downwardly against the tension of its spring 23, the corresponding link 25 being then moved downwardly and causing the lever 28 to swing rearwardly, and through its cam roll 28n forcing the cam lever 34 to swing rearwards and thereby push its type bar, by means of its link 39, to the impression point. Whenthe front end of a type-bar actuating key lever 15 is relieved of downward spring 23n e'ects an Aautomatic return of the key lever and type bar together with inner side of a side frame, there is fixed an upwardly extending Aapproximately T- shaped, rocker caln 46 formed vwith a cam slot 4Ga which extends from end to end of the head of the cam above and crosswise of the rocker shaft 45. A

The forward end portion 47 of this slot where the cam slot has a forward dwell surface, is, in relation to the shaft 45, lower than the rearward end portion 48 of the slot at which it has a rearward dwell surface.

The rocker cam'46 has a laterally projecting stud 49 above and rearwardly of the rocker shaft 45, and therear .end of a forwardly projecting link 50 is pivoted thereon, the forward end of the link being pivoted at 51 to the lower end of the rear-` warch arm of the inverted V-shaped, single', carriage shift lever which is pivotally supported on an inwardly projecting stud 54 of one of the side frames.v

The under apical portion of each approximately V-shaped rocker arm 13' connected with the carriage gnide'and lifting rod 12,

has a laterally projecting stud 55 on its inward faceand this stud carries a cam rolly 56 which works in the cam slot 46a. ofthe cam lever 46.

As shown in Fig; 2, the platen and paper carriage is in its lower position, the shift key 53'being in depressed position against the tension of .the shifty key return spring 57, shown as a coiled springl the rear endg of which is f/ixed at 58 to the rear arm 52 of the shift key and the front end of which is Vfired at 59 to a sideA frame 3,. forwardly pressure, the tension of the then expanded of the rear arm 52. When pressure on the shift key is released, contraction of `the spring 57 'causes the rockable cam lever 46 to rock downwardly and forwardly, thereby causing the under edge of its cam slot to push forwardly and unwardly against the cam roll 56 and thereby lift said rocker frame comprising the carriage guide and lifting rod 12, and the tube l() to which the carriage end plates are xed, to bring the impression point of the platen to the upper printing position. In the higher position of the carriage, each cam roll 56 is ata dwell in the higher and rearward portion,

48 of the cam slots in the lopposed rockable cams 46.

The escapement mechanism comprises, for the upstanding teeth of the lengthwise toothed 'rack-bar R, a pinion 60 fixed on a revoluble spindle 61 at right angles to the carriage feed path. Spindle 61 is ournalled in a tubular, spindle holder 60;i which is provided with a flange 61*1 at its rear end. One end of a forwardly projecting leafspring 62 (Fig. 4) is xed at 63 to the upper side of a horizontally pivoted transverse bracket of which the spindle holder forms a part, the forward end portion of' the leaf spring passing under a laterally projecting lug 64 of the spindle holder and the front free end- 65 of the spring bearing against the under side of the usual paper guide 66 between which and the platen roll the paper is moved. i The spindle 61 has .loose on it, (Fig. 3) adjacent the rear side of its flange 61, a toothed star wheel l67 on the rear' face of which there is a projecting stud '68 carrying a spring pressed pawl 69 for co-operation with a ratchet Wheel 70 of lesser diameter than the toothed wheel 67 and which is fixed on the rear end of the spindle. The spindle holder carrying bracket comprises oppositely projecting yoke arms 60", the ends of which yoke arms are alined. The bracketA thus formed is rockably mounted on alined horizontal pivots 71 each carried by an upstanding' arm 72.0f the rear frame member 1".

The radial teeth of the toothed star wheel 67 are indicated by 7 3. The pawl 69 on the star wheel in engagement with a tooth of the ratchet wheel 70 preventsy rotation of the star wheel in counterclockwise direction but permits'rotation of the star `wheel in clockwise direction 'as' viewed in Fig. 3. The carriage 1s drawn 1n-one dlrectlon, as-

nsual, by a coiledspring 74', as indicated by the larrow on its vdruml 75, the pawl and ratchet o n the star-wheel then preventing rotation of the star wheel, spindle and rack engaging. pinion in the direction of the pull of the spring 74, when the type bar is in position of initiaL-rest. l

Whenever a type Tbar is depressed, a vertically swinging and horizontally movable escapenient dog 76 pivoted on a stud 77 projecting rearwardly and horizontally from a vertical rocker bracket ,78, moves laterally rearwards out of engagement With a tooth of the star wheel; a vrigid escapement dog 79 directly in front of the movable dog 76 then engaging such tooth and holding the star wheel from. rotation while the printing impression is being made.

The rigid escapement dog,79 is formed by the free end of a rigid horizontal arm 78" which projects from the upper end of the vertically mounted bracket 78; and in the rearward rocking movementv of the rocker bracket 78 the pivoted escapement dog is moved laterall \7 rearwards from under a star wheel tooth. By a follow upl motion,

the rigid escapement dog is swung into the pla-ce of the pivoted dog under the same star wheel tooth. v

l `\The Yupstanding rocker bracket 78 has its ends alined and severally pivoted at 79"L in an :arm of a vertical U-shaped bracket 8O which is integral with one of the: horizontal' yoke arms 60b of the spindle holding bracket. l

The rocker-,bracket 78 carries on its rear side a pivoted wiper cam 81 the upper edge of which contacts with the under edge of the pivoted escapernent dog 76 and the under edge of which contacts with a horizontal straight portion 82 of a coiled spring 83, the free end of the straight portion being hooked through a hole in a horn 84 in the wiper cam adjacent but below its pivot, and the free end of its coiled portion being fixed at 83a to the upstanding U- shaped bracket 80 which is oscillatable on the horizontal pivots 71.

The star Wheel 67 and the pinion spindle 61 are accordingly vibratable in a vertical plane at right angles to and above the rackbar R; and when the carriage is shifted up- `IWardly, the pinion 60 engaged by the rack is lifted, with its teeth in constant mesh with the upstanding toothed web of the f rack-bar R, which is Shown L-shape in cross-section;V and 'the carriage, with its rack-bar, and the spindle with its rack-bar engaging inion and are lifted together.

On the downward shift of the paper carriage, said lifted members descend in unison, the pinion and rack-bar being in constant mesh during such downward shift. The leaf spring 62 is in action during all shifting .movements of the carriage, and at all times when the type-bar actuating keys are lll) depressed, and also during the return of the kevs to initial positions of rest. v

en 'a line has been printed and it is desired to return the carriage to starting position, the carriage may be manually `pushed endwise to effect such return as usual; the pawl 69 on the star wheel 67 then riding freely over the teeth of the` ratchet adjacent the star wheel' andV iixed onI the pinion spindle 59. 1 When it is desired to return the carriage,

, mechanically and silently, the rack engag- 5 'ing pinion 60 is raised out of engagement vwith the rack-bar R by Ameans of 'a horizontally slidable, release bar 85 (Fig. 3)

which is provided with inclined cam slots 86 in which rearwardly projectingstuds 87 on the rack-bar work; one end of the release bar having an upturned linger end 88 at a side of the machine and accessible to the operator for manual pressure. The slots 86 are parallel and are formed slantingly in the release bar, the slots extending -upwardly and slantingly in a direction away from the upturned finger end 88. When the release bar is moved from its position shown in Fig. 3, it is raised by the camaction of the inclined slot walls on the rack-bar studs 8 7 with the effeet of lifting the release bar toa higher level and inso doing pushing'its upper edge against the under sides of the yoke arms 60b that support the star wheel and pinion carrying spindle; this vupward movement of the yoke arms being against the yielding resistance of the free/end of the leaf spring l 62 that is always in gentle contact with .the 3 paper guide and which, being a fixed member of the carriage, slides over the rfree e/nd 65 of the spring.

I have pointed out above that atl the moment of impression, the rigid escapement` dog is moved into Avthe place inst lformerly occupied by the pivoted escapementdog under a given 'star wheel tooth, whereby the star wheel is held from rotation and the paper carriage isheld stationary at the 40 moment -of impression. Inits movement *from under thejtooth referred to, the pivoted escapement dog is moved," first llaterally rearwards by. its rocking. movement, and 'is next pressed upwardly by the 4 5 wiper cam and the wi r cam spring; and

p is next moved Alater l space between said star wheel tooth and the next succeeding star Awheel .tooth and contacts with the latter tooththe rotational. ,50 ldescent4 of which presses the against the upper edge of the wiper cam 81 and depresses the latter against the tension of its 'spring`83. 'j

. The-rigid escapement dog 79 has a forwardly projecting free end; and this lug hase, vertical hole 90, -shown square, through it, the hole loosely receiving'the upper 'end standing lever 91, the lower end of which is pivoted at 92 tothe 4rear transverseframe member 1*.l Between its ends, this lever 91 has pivoted to it at 93, the rear end of a forwardly extending link 94, the front end 'of which is pivoted at 95.130 the rear end fof a dependent' rocker arm 96 ixedpn a inwardly 'rear transverse the under side of the y forwards into the pivoted do'g lug 89 inwardly 'of its- J' *.ting, transversely transverse rocker shaft 97,'the ends of which are journalled in the side frames of the machine. This rocker shaft 97 is provided near each journalled end with a fixed rocker ann 98, the frontends ofthe rocker arms 98 being connected by the transverse univ versal bar 99 of the machine. l

All the type bar actuating key levers cross the universal bar and eo-operate 'as usual with the universal bar to force it d ownwardly, in which movement the escapement mechanism is actuated for' swinging the iixed escapement dog into engagement witha star wheel tooth; the depression of the universal bar being against the tension of a 30 coiled spring 100, one end of which is fixed at 101 tothe dependent rocker arm 96 and the other end of which is fixed at 102 to -the shaft 20. Thectension of spring 100- .V keeps the transverse universal bar '99 for 9 5 each of the key levers. in .constant contact with the under edges of the key levers, so that, there is no hammering effect between the universal bar and the keylevers the operation of the 4machine in this respect' 90 is also silent; and in this connection 1t' is to bei said that the operation of the link 25, lever28, cam lever 34, link-39, and typel bar 43 with its under and uppersupporting plates 7 and' 8, respect'vely,fis practically 95 silent or noiseless. f

The carriage rack-bar R upper eriphery of an anti-friction roll'103 (Eig. which is journalled on a stud 104 carried by the free vend of a vertically 10 swinging arm 105, the other end of which isf,y pivotedI on a tud 106 projeeting-fnom their rear transverse framev member 1. A stout)l coiled spring 107 is located en the stud with one end anchored at 108 in the'swing- 105 ing arm and` its other anchored at 109 inthe frame member,the spring exerting a constant upward plre'ssure on the swinging arm to keep t e roll against rack-bar R with sufficient pressure nearly balance the weight of the paper carriage; v l' l In the contructionshowmthe center of gravity of the carriage is rearwards of the axis of-thesupporting rod A12. Consequently thel carriage leans rearwardly and 1s therefore provided onits'rear slde with a trans verse fixed web 110, the ends of 'which are attached tothe paper carriage end plates 9. The rear' iiange 111 of the web is parallel 120 to the printing line position ofthe platen rides on the -and is made stra'htand bears slidably of an upagainstthe front ge of `a transverse barl of which arel fixed at 113 edges of the frame corner 125 arms 2. The bar 112 is dimensioned to be laterally springable between its fixed ends; and the opposite end portions ofthe bar have integral with them a rearwardly proextending truss'114 at 13 112,- the .ends to the upper and r `rocking' cam 46. The horizontal the mid-section of which and directly opposed to the impression point at p, the bar is provided with a horizontal adjusting screw 115threaded in a nut 116 at its front end and at its rear end in a nut 117 fixed to the truss. The front end of the nut 116 is shown pointed vandbearing against the springable bar112. This is an old con- `struction for t-he purpose of adjusting the platen AJorwardly and closer to the extreme rearward limit of the type bar movement, so as to obtain a heavier impression, if desired, at the printing point. A key actuated means for holding the front end arm 53 of the platen shift mechanism down is provided, the key of such locking means being indicated by 118. When the shift key member 53 is depressed, the platen carriage is in its lowermost position. A cushion 119 is located at each end of the path of each yoke structure 60a, 60b forms a vibratable pinionspindle carrier, and the vertical bracket 78 forms a vibratable escapement dog carrier.

What I claim is: i

1. In a typewriting machine, the combination of a type barv having a plurality of printing characters spaced apart one from another; a type bar actuating mechanism; an endwise movable platen and paper carriage provided with a lengthwise extending rack bar for cooperation with an escapement mechanism; an escapement mechanism comprising a vibratable pinion spindle carrier; a revoluble spindle mounted in the carrier;

on an end of the spindle, a pinion for engagement with the rack bar; onsuch other end of the spindle, a star wheel loosely mounted on the spindle; on the star wheel, a pawl; fixed on the other end of the spindle a ratchet wheel for cooperation with the pawl; carried by -the vibratablespindle pinion carrier, a Avibratable escapement dog carrierprovided with a fixed dog, a swingable dog, and a swingable wiper cam for the vibratable dog; and for the wiper cam a spring for returning it. to normal position; and a spring for effecting travel of the paper carriage lengthwise in one direction; a key actuated, carriage-shift mechanism operatively connected withthe carriage; and mechanism between the escapement mechanism and the type bar actuating mechanism for actuating the escapement mechanism synchronously with the actuation of the type bar actuating mechanism.

2. In a typewriting machine, the combination of an endwise reciprocable type bar; an endwise movable platen and papergoarriage; a type bar 'actuating' key; between the type bar' and said key ay link having one 'end pivotally connected to the type bar and its other end pivotally connected to a swinging cam; such cam; a lever pivoted at one end to a fixed pivot and being in operative connection with the swinging cam; a link pivotally connected at one end to said lever and at its other end to a swinging wiper cam, a surface of which is in cooperative relation to said key; and a Aspring connected to said wiper cam and against the tension of which the wiper cam is moved when the said key is depressed; the carriage being provided with a rack bar for cooperation with an escapement mechanism; such escapement mechanism and operative connections between the escapement mechanismand the type bar actuating mechanism.

3. In a typewriting machine, the combination of an endwise reciprocabl-e type bar and a key actuated type bar reciprocating mechanism'comprising a member in detachable connection with the type bar; and demountable means for holding the type bar in working position whereby the type bar may be readily removed for replacement by another type bar.

4. In a typewriting machine, the combination off an endwise reciprocable type bar; a type bar actuating key and a mechanism for operatively connecting the type bar and said key, such mechanism comprising a pivoted wiper cam having a cam wall for cooperation with the type bar and also having a cam wall for -contact with the straightened extension of a spiral spring, when said key lever is depressed; and such spiral spring; the spring having a straightened extension in 'the path of the Wiper cam and having one end secured tothe Wiper cam and its other end fixedly secured.

5. The combination, in a -typewriting machine, of a paper carriage and paper car-,

riage actuating mechanism with a type head actuating mechanism comp-rising a depres-V sible and automatically returnable key lever; a rockable wiper cam having op osed cam surfaces; and a coiled spring aving a straightened end portion attached to the wiper cam `and positioned to be progressively engaged by one of the cam surfaces of the wiper cam, the other end-of the coiled spring being anchored to the machine; and

the key lever having a. member maintained by the tension of said spring in constant contact with the other cam edge of the Wiper cam.

6. The combination, in a typeWri-ting machine, of, a-fpaper carriage and paper carriage actuating mechanism with a type head actuating medhanism comprising a depressible and automatically returnable key lever; a rockable Wiper cam having opposed cam surfaces; and a coiled spring having a straightened end portion attached to the Wiper cam and -positioned to be proo'ressively engaged by one of the cam'su aces of the wiper cam, the other end ofthe coiled spring being anchored to the machine; and

the keylever having a member maintained .underside of the key lever.

spring, all combined and of said spring in constant other cam edge of the a rockable universal bar mechanismg'and a spring for keepin@ the universal bar in constant contact with the by the tension contact with the wiper cani; and

7.. In a typewriting machine, the com- :bination with a vertically shiftable Iendwisev movable paper carriage and a type head having a plurality printing characters one above another of a type head actuating mechanism comprising an impression key lever and togglelink members between the key lever and type head, and also comprising a swingable wiper cam and a wiper cam. and key lever return spring, the wiper cam supporting the key lever in position of rest under tension of the spring, and the wiper cam having a surface which, when the key lever is depressed,

progressively engages the spring and puts` it under increasing tensionvuntil the depressing pressure on the key lever is removed. 8. ln a typewriting machine, the combination of a toggle lever actuated type head having a plurality 'of printing characters; an impression key operatively connected with said toggle lever mechanism an endwise movable and vertically shiftable paper carriage slidably mounted on a transversely extending, upwardly and downwardly shiftable carriage guide and lifting rod; said rod, the carriage being provided with a slotted fixed tube within and by which the rod is embraced; a pair of rocker arms, each pivot-ally mounted on a stationary member of the ma'- chine, and each rocker" arm having a cam wall engaging projection and also havin an upwardly extending portion fixed in said rod andextending through the tube slot; a transverse rocker shaft journaled in stationary members ofthe machine and having fixed to it' a pair of lengthwise slotted carriage shitting cams for reception of a rocker arm projection; a shift key pivoted to one of said shifting cams; and a shift key return operating to eect printing and carriage shift vmovements with a minimum of noise; the machine being conof spaced apart type head actuatingv each having a 'plurality of printing characv ters,- of a vertically shiftable andendwise movable paper carriage having a track engaging member; a track supporting mecha-y msm pivota-lly mounted on stationary pivoting means and comprising a 'rockable, track supporting structure having a cam engaging projection; a rocker'shaft journaled in sta.- tionary bearings and provided with a fixed rocker tively working with said projection; and, for rocking the rocker shaft and the cam and thereby imparting a rocking movement .to the pivotally mounted track supporting mechanism, a key actuated platen shift mechanism comprisinga constant pivotal connection with the rocker cam structure.

10. ln a typewriting machine, the combination with a vertically shiftable, endwise movable paper carriage and a type cam having a cam surface opera..

a member having head having a plurality of printing cha-racters spaced one above another thereon, of a type head actuatingmechanism comprising an impression key lever, toggle link members between the key lever and head, and a wiper cam and spring tending to return said parts to a. position of rest, said cam being larranged when said lever is depressed, to

progessively engage and tension said spring. l1. In a typewriting machine, theA combination ywith an endwisemovable `paper carriage provided with a rack bar, of an escapement mechanism comprising a spindle provided ment with said rack bar, ing said spindle for tilting movement to carry said pinion into and .out of engagement. with said rack bar to release the latter, and means for effecting said tilting movement of saidspindle.

Signed at New York, New York and State of New York, this 20th day of August A. D. 1920.

wELLiNGToN PARKER KIDDER.

with a pinion for meshing engagea device supportin the county ot 

